What is the name of the wizarding sport book J.K. Rowling published for charity in 2001?

J.K. Rowling’s 2001 charity book about wizarding sport is Quidditch Through the Ages.

Quidditch Through the Ages was published under the fictional author name Kennilworthy Whisp. It is designed to resemble a library book from Hogwarts and describes the history, rules, equipment, teams, and development of Quidditch in the wizarding world.

The book was issued alongside Fantastic Beasts and Where to Find Them as a charity publication. Revenue from the original editions supported Comic Relief, a British charity that funds work addressing poverty and social injustice. The project turned two fictional Hogwarts books into real-world fundraising publications.

The title is sometimes confused with the Quidditch material in the Harry Potter novels or with later screen adaptations. It is a standalone companion volume, not one of the seven main novels. Its mock-scholarly format also explains why the credited author is not Rowling’s own name.